CVE-2004-0189 describes a URL decoding vulnerability in Squid 2.5STABLE4 and earlier, where a NULL character (%00) in a URL can bypass url_regex ACLs. This allows remote, unauthenticated attackers to gain unauthorized access by causing Squid to evaluate only a partial URL against its access control lists. With a CVSS score of 7.5, this vulnerability is considered high severity due to its network-based attack vector, low complexity, and potential for partial compromise of confidentiality, integrity, and availability. While not listed in CISA's KEV catalog, an ExploitDB entry confirms the existence of exploit code, though there is no evidence of active exploitation or significant community discussion.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
2.0_patch2CPE matchmatch criteria | cpe:2.3:a:squid:squid:2.0_patch2:*:*:*:*:*:*:* | ||
2.1_patch2CPE matchmatch criteria | cpe:2.3:a:squid:squid:2.1_patch2:*:*:*:*:*:*:* | ||
2.3_stable5CPE matchmatch criteria | cpe:2.3:a:squid:squid:2.3_stable5:*:*:*:*:*:*:* | ||
2.4CPE matchmatch criteria | cpe:2.3:a:squid:squid:2.4:*:*:*:*:*:*:* | ||
2.4_stable7CPE matchmatch criteria | cpe:2.3:a:squid:squid:2.4_stable7:*:*:*:*:*:*:* |
CVSS version used by this source: 2.0
AV:N/AC:L/Au:N/C:P/I:P/A:P
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The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.